6 Service implementations WCS implementation Rasdaman Deegree EOxServer MapServer ESRI ArcGIS Server GeoServer Description Rasdaman is the most mature implementation of the WCS interface standard, with version of the standard being reflected within the software (both in terms of core and WCS extensions). Deegree is a portal solution providing means for establishment of OGC web services with the perspective of an SDI in mind. The products can be used to establish WCS services. EOxServer is a server side open source application which implements WCS 2.0 with the earth observation profile enabled. MapServer is a server side open source application which provides full support of WCS and earlier, and partial support to WCS 2.0. The proprietary ESRI ArcGIS server (9.3 and above) supports WCS versions and below. GeoServer is a portal solution which can be used to establish WCS services with supported versions 2.0 and above

7 WCS clients WCS client Description GDAL The Geospatial Data Abstraction Library (GDAL) is a widely used open source library which provides support for a huge number of raster formats, used within the geospatial domain. GDAL supports WCS version only. GDAL acts as a client to WCS through creating a local xml file which contains the coverage server url, together with the name of the requested coverage. GRASS The GRASS Desktop GIS inherits from the GDAL library support WCS Connection to a WCS instance is achieved through GDAL, and the location of the service and the required coverage should be provided within a text file for being called by the r.external command of GRASS. ESRI ArcGIS Desktop ESRI ArcGIS Desktop can be used as a client for WCS, supporting version and below of the standard. QuantumGIS The open source desktop QuantumGIS has a native support for WCS and

8 Mapping of WCS to INSPIRE NS Regulation Pre-defined dataset download service operations INSPIRE requirement WCS operations 1. Get Download Service Metadata GetCapabilities 2. Get Spatial Data Set GetCoverage 3. Describe Spatial Data Set DescribeCoverage 4. Link Download Service xlink The central element of the WCS is the coverage, the most suitable approach to complying with Get Spatial Data Set would be to equalize a dataset to a coverage. CRS extension of WCS should be enabled to ensure that coverages are provided in any of the offered coordinate reference systems ST=GetCoverage&COVERAGEID=&Coverage001&CRS=3035

9 Mapping of WCS to INSPIRE NS Regulation Direct access download service operations INSPIRE requirement WCS operations 5. Get Spatial Object GetCoverage (incl. optional query parameters for subsetting the coverage) 6. Describe Spatial Object Type GetCapabilities The Get Spatial Object operation allows the retrieval of spatial objects based upon a query The GetCoverage operation can be used together with the parameters for subsetting (trim, slice) the offered coverages.

10 Conclusions Lessons learned from work on SOS would make it easier to extend TG WCS standard is mature & Implementations are diverse and well supported. TG update Extension of WCS GetCapabilities with INSPIRE-specific section TG should be extended to include WCS section Level of complexity of the TG Implications from hybrid solutions (Atom+WCS, SOS+WCS, etc.)

11 Discussion Definition of a spatial object in a coverage dataset? How to avoid WCS, SOS, etc. silos? Support of WCS version 2.0 and above in client solutions (ex. inherited from GDAL )? Implications of an WCS download service for other types of INSPIRE services (View, Discovery)? WCS & WCPS?

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